About Clock-Tani
Clock-Tani provides a variety of free time tools in one website for your daily needs.
About the Developer
Clock-Tani is developed and maintained by the Jeokjeongin team with over 10 years of web development experience. Our philosophy is to create tools that are genuinely useful, with minimal ads and maximum usability.
As a team specializing in frontend and full-stack web development, we are proficient in modern tech stacks including React, Next.js, and TypeScript. Drawing from diverse experience ranging from personal projects to commercial services, we aim to deliver time tools that are truly convenient to use.
Our Services
World clock for 70+ cities, digital/analog display
Millisecond precision, lap recording
Presets, 5 alarm sounds, screen wake lock
25 min focus + 5 min break, session statistics
Tabata, HIIT presets
Run up to 4 timers simultaneously
Multiple alarms, snooze, 5 alarm sounds
NTP sync, ticketing countdown
Anniversaries, exams, event countdowns
Features
- Completely free, no registration required
- Responsive design for mobile & desktop
- Bilingual support (Korean/English)
- Dark mode support
- Data stored locally in browser only (no server transmission)
- PWA support - install as an app
Service History
Clock-Tani development started
Launched online clock, stopwatch, and timer
Added Pomodoro, alarm, and server time features
Added interval timer, multi timer, and D-Day counter
Released multilingual (English) support and PWA
Ongoing feature improvements and usability updates
Technology Stack
Clock-Tani uses cutting-edge web technologies to deliver a fast and reliable service.
Optimal performance through server-side rendering and static site generation
High code quality through type safety
Consistent and responsive design system
Offline support and app-like user experience
Precise alarm playback with no delay
Prevents screen from turning off during timers
Contact
For inquiries, bug reports, or suggestions, please email us below.
We typically respond within 1-2 business days. Feature suggestions and improvement requests are always welcome.